119 
Nearly an hour was spent in collecting from the latter locality, 
and though the fossils are somewhat rotten, and with difliculty 
extracted whole, they are often entire before removal from the 
matrix, and are thus presumably im situ. Some large, strong 
shells and, as usual, very small ones came out perfect enough. 
The following is a list of the determinable species obtained ; 
those marked with an asterisk have been collected previously in 
the general section :— 
*Voluta anticingulata *Leda embolos 
*Natica Wintlei *  apiculata 
*¢  polita *Limopsis Belcheri 
*Turritella septifraga “Pectunculus laticostatus 
eS conspicabilis xs cainozoicus 
Mathilda bicarinata *Barbatia interclathrata 
Odostomia Victorie *Cucullzea Corioensis 
Kulimella gracillissima *“Crassatella Hallii 
Liotia Roblini “Cardita polynema 
*Tinostoma parvula «¢ aff. C. solida 
*Kumargarita strigata *Carditella inornata 
*Ringicula lactea . *Chione multiteniata 
Volvulella sp. oA teritbehardy 
*EKntalis Mantelli Corbula ephamilla 
* « ~ subfissura *Salenaria, two sp. 
*Dentalium bifrons *Vincularia, sp. 
+ ia aratum *Flabellum Victorize 
Spiralis tertiaria *Placotrochus deltoideus 
*Dimya dissimilis Notocyathus sp. 
*Pecten Foulcheri * | *Deltocyathus Italicus 
* §¢  Murrayana *Bathyactis discus 
*  §*  Hochstetteri *Cornuspira involvens 
#075) dueens *Biloculina depressa 
*Spondylus geederopoides *Miliolina seminulum 
*Nucula tumida 
Out of 39 species of mollusca here recorded eight appear in the 
section for the first time, which is a rather large percentage of 
fresh species for an hour’s collecting. Some remarks upon this 
matter will be made later on. Many of the most characteristic 
Spring Creek shells are, however, represented. 
Since the molluscan beds thus overlie as well as underlie the 
echinoderm rock the latter cannot be assigned to either a higher 
or lower horizon, but must be regarded as practically of equiva- 
lent geological age, and its different lithological character as well 
as the greater prevalence of certain species of fossils, together 
with the scarcity or absence of others, may be due to change in 
the sediments, and probably also to oscillations of level in the 
area of deposition during the Eocene period. 
The only other point on which any difference of opinion can 
exist is as to the relationship of the Echinoderm and Polyzoal 
rocks. Possibly there are some slight lithological differences be- 
tween them, but, as is well known, variations of this kind are not 
